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Prepayments and Other Current Assets (Tables)
 3 Months Ended
Mar. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of prepayments and other current assets
  March 31,   December 31, 
   2019   2018 
Prepaid land lease  $307,418   $437,114 
Value-added tax recoverable   5,871,234    5,760,280 
Others   35,167    43,905 
   $6,213,819   $6,241,299